Bug 146956 has some extra logs, unfortunately I neither catched the /var/lb/dpkg/updates/... file. I fixed the installation with manually sudo dpkg -i:ing the python-apt package in /var/cache/apt/archives/ and then sudo dpkg --configure -a.
Bug 146956 has some extra logs, unfortunately I neither catched the /var/lb/ dpkg/updates/ ... file. I fixed the installation with manually sudo dpkg -i:ing the python-apt package in /var/cache/ apt/archives/ and then sudo dpkg --configure -a.